var currentNum = 1;



function slideImage(mode) {
    var photo_dz = document.getElementById("photo_dz");
    
    if(mode == "next") {
        currentNum += 1;
    }
    else {
        currentNum -= 1;
    }
    
    
    var prevBtn = document.getElementById("slide-prev");
    
    if(currentNum == 1) {
        prevBtn.style.visibility = "hidden";
    }
    else {
        prevBtn.style.visibility = "visible";
    }


    var nextBtn = document.getElementById("slide-next");
    if(currentNum == 26) {
        nextBtn.style.visibility = "hidden";
    }
    else {
        nextBtn.style.visibility = "visible";
    }

    
    photo_dz.src = "../img/dz/photo_" + currentNum + ".jpg";
}




function slideImage_mg(mode) {
    var photo_mg = document.getElementById("photo_mg");
    
    if(mode == "next") {
        currentNum += 1;
    }
    else {
        currentNum -= 1;
    }
    
    
    var prevBtn = document.getElementById("slide-prev_mg");
    
    if(currentNum == 1) {
        prevBtn.style.visibility = "hidden";
    }
    else {
        prevBtn.style.visibility = "visible";
    }


    var nextBtn = document.getElementById("slide-next_mg");
    if(currentNum == 3) {
        nextBtn.style.visibility = "hidden";
    }
    else {
        nextBtn.style.visibility = "visible";
    }

    
    photo_mg.src = "../img/mg/photo_" + currentNum + ".jpg";
}